First ultrasound appt ?

Carmen • Expecting our baby girl December 15 💗💗💗 👶 6.16.17 wedding date. Massachusetts girl in the sunshine state. Disney lover annual pass holder ❤️ dog mom to my puggle

According to the app and my last period I should be due on december 15. So this app is telling me I’m four weeks three days roughly. How early do they do an ultrasound for someone? I’m having my first appt April 26 to just confirm I’m pregnant but my husband asked to leave work early to come with me I’m hoping they will just do it then. Thoughts ?